I wouldn't necessarily agree with you, look at google maps which have improved in quality, But this happened through a dedicated commitment to the project.
But in the other hand I have noticed that there are google "quality control" issues which I have experienced. A few of the patents in Google Patents have bad and unreadable pages (especially with the drawings) or are scanned crooked as an example.
I suspect that the wireless network is oversubscribed where you have people jamming each other (and the router) to get into a local router. This can be a problem with any radio technology when you have too many users on a channel. And google probably does not make money on this project and hence allocate resources for other things.
But this is a larger issue with WiFi networks in general. People think it's an infinite resource and can replace traditional wires everywhere. I assure you, it is not and can not.